title: Laser-based linear and nonlinear guided elastic waves at surfaces (2D) and wedges (1D).
abstract: The characteristic features and applications of linear and nonlinear guided elastic waves propagating along surfaces (2D) and wedges (1D) are discussed. Laser-based excitation, detection, or contact-free analysis of these guided waves with pump-probe methods are reviewed. Determination of material parameters by broadband surface acoustic waves (SAWs) and other applications in nondestructive evaluation (NDE) are considered. The realization of nonlinear SAWs in the form of solitary waves and as shock waves, used for the determination of the fracture strength, is described. The unique properties of dispersion-free wedge waves (WWs) propagating along homogeneous wedges and of dispersive wedge waves observed in the presence of wedge modifications such as tip truncation or coatings are outlined. Theoretical and experimental results on nonlinear wedge waves in isotropic and anisotropic solids are presented.
authors.affiliation: Institute of Physical Chemistry, University of Heidelberg, D-69120 Heidelberg, Germany. Electronic address: peter.hess@urz.uni-heidelberg.de.
authors.forename: Peter
authors.initials: P
authors.lastname: Hess
authors.forename: Alexey M
authors.initials: AM
authors.lastname: Lomonosov
authors.forename: Andreas P
authors.initials: AP
authors.lastname: Mayer
mesh_terms: D000465:Algorithms; D054459:Elasticity Imaging Techniques / Q000295:instrumentation* / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D007834:Lasers; D012542:Scattering, Radiation
keywords: Laser ultrasonics; One- and two-dimensional waveguides; Surface acoustic waves (SAWs); Wedge waves (WWs)